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  • Hindawi Limited  (25)
  • 1
    Online Resource
    Online Resource
    Deformation and Failure Mechanism of Surrounding Rock in Mining-Influenced Roadway and the Control Technology
    Hindawi Limited ; 2021
    In:  Shock and Vibration Vol. 2021 ( 2021-4-17), p. 1-14
    Details
    In: Shock and Vibration, Hindawi Limited, Vol. 2021 ( 2021-4-17), p. 1-14
    Abstract: Aiming at the problem of surrounding rock deformation and failure of mining roadway and its control, a mechanical model of the circular roadway under the mining environment is established, and the implicit equation of the plastic zone boundary is derived. By analyzing the morphologic evolution law of the surrounding rock plastic zone in the mining roadway, the key factors affecting the morphologic change of the plastic zone are obtained, that is, the magnitude and direction of principal stress. The influence law of the magnitude and direction of principal stress on the plastic zone of the mining roadway is analyzed by using numerical simulation software, and the deformation and failure mechanism of surrounding rock of the mining roadway is revealed. The results showed that the size and morphology of the plastic zone were closely related to the confining pressure ratio (η). Taking the boundary of η valuing 1, the larger or smaller η value was, the more serious the deformation and failure of surrounding rock would be; the morphology of the plastic zone changed with the deflection of the principal stress, with the location of the maximum plastic zone influenced by the principal stress direction. For the surrounding rock control in the mining-influenced roadway, it is advised to take the following methods: firstly, it is necessary to consider how to reduce or remove the influence of mining on surrounding rock, improve the stress environment of surrounding rock, and reduce the failure depth of the plastic zone, so as to better maintain the roadway. Secondly, in view of the deformation and failure characteristics of the mining roadway, the fractional support method of “yielding first and then resisting” should be adopted, which applies the cable supplement support after mining instead of the one-off high-strength support during roadway excavation, so as to control the malignant expansion of the surrounding rock plastic zone and prevent roof falling accidents.
    Type of Medium: Online Resource
    ISSN: 1875-9203 , 1070-9622
    URL: Article
    DOI: 10.1155/2021/5588314
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2021
    detail.hit.zdb_id: 2070162-7
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  • 2
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    Online Resource
    An Integral Numerical Analysis of Impact of a Commercial Aircraft on Nuclear Containment
    Hindawi Limited ; 2019
    In:  Science and Technology of Nuclear Installations Vol. 2019 ( 2019-10-13), p. 1-15
    Details
    In: Science and Technology of Nuclear Installations, Hindawi Limited, Vol. 2019 ( 2019-10-13), p. 1-15
    Abstract: After the September 11 attack, the resistant capability of containments against aircraft impacts is required to be assessed for newly constructed nuclear power plants (NPPs). In this paper, the crash of a commercial airplane Boeing 767-200ER on the reinforced concrete containment building of an NPP is analyzed using the missile-target interaction method. Two plane models with the same total weight but different fuel distribution are analyzed. The force-time history obtained by FEA (finite element analysis) is compared with the one calculated by the Riera function. In the integral analysis, the mesh sensitivity of the reinforced concrete containment model is studied, and recommendations are provided on the modelling of containment. The impact phenomenon and damage on the containment are investigated through the validated model. The fuel distribution in the aircraft is found to have strong influence on the damage of the containment, which indicates that the load distribution in the transverse direction is critical in the analysis of aircraft impact. The classic load-time function analysis is unable to incorporate this factor and may not be adequate to provide satisfactory results. For this reason, the application of an integral analysis is advantageous in the safety assessment of aircraft impact.
    Type of Medium: Online Resource
    ISSN: 1687-6075 , 1687-6083
    URL: Article
    DOI: 10.1155/2019/9417954
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2397941-0
    SSG: 3,6
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  • 3
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    Cardiopulmonary Rehabilitation in Elderly Patients with Heart Failure: A Prospective Cohort Study
    Hindawi Limited ; 2022
    In:  Journal of Healthcare Engineering Vol. 2022 ( 2022-4-1), p. 1-6
    Details
    In: Journal of Healthcare Engineering, Hindawi Limited, Vol. 2022 ( 2022-4-1), p. 1-6
    Abstract: Objective. To determine the impact of cardiopulmonary rehabilitation administered through WeChat on exercising resilience and life quality in aged people with heart failure (HF). Methods. We conducted prospective cohort study that included 80 heart failure patients who were admitted to the Second Affiliated Hospital of Wenzhou Medical University from June 2018 to September 2020, 80 patients with heart failure. Patients were grouped according to their use of WeChat for rehabilitation. WeChat cohort provides remote supervision of rehabilitation and nursing guidance through WeChat. Specifically, the findings below were predetermined and compared across treatment groups utilizing analysis of variance corrected for baseline levels of the end measure and location: changes in the length of cardiopulmonary exercise tests, peak VO2, the proportion of predicted maximum VO2, and variation in the distance covered during the 6-minute walk distance (6MWD) assessment. Comparison of negative emotions between two groups, a Self-rating Depression Scale (SDS) and Self-rating Anxiety Scale (SAS), and Survey Short Form-36 (SF36) at baseline and at month 2. Results. In contrast with the control cohort, the WeChat cohort did not show any significant differences in general data ( P   〉  0.05). After the rehabilitation, the WeChat group has a notably higher level in 6MWD than in the control group. Prior to the rehabilitation, there were no statistical gaps between the two cohorts in terms of SAS and SDS scores ( P   〉  0.05). Even though the two cohorts saw a decline in SAS and SDS scores following nursing, the observation cohort indicated a much relatively low level in contrast with the control cohort ( P   〈  0.05). The comparison of the SF-36 scores between the two cohorts revealed no significant differences ( P   〉  0.05). Following nursing, the scores of the two cohorts declined significantly, with the control cohort scoring far lower than the other ( P   〈  0.05). Conclusions. In summary, cardiopulmonary rehabilitation via WeChat is very beneficial for HF patients who are at a stable phase of the disease. It may substantially improve patients’ exercise stamina, reduce adverse emotions, boost patients’ quality of life, and have significant clinical relevance.
    Type of Medium: Online Resource
    ISSN: 2040-2309 , 2040-2295
    URL: Article
    DOI: 10.1155/2022/4923007
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2545054-2
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  • 4
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    Immunomodulatory Functions of Mesenchymal Stem Cells in Tissue Engineering
    Hindawi Limited ; 2019
    In:  Stem Cells International Vol. 2019 ( 2019-01-13), p. 1-18
    Details
    In: Stem Cells International, Hindawi Limited, Vol. 2019 ( 2019-01-13), p. 1-18
    Abstract: The inflammatory response to chronic injury affects tissue regeneration and has become an important factor influencing the prognosis of patients. In previous stem cell treatments, it was revealed that stem cells not only have the ability for direct differentiation or regeneration in chronic tissue damage but also have a regulatory effect on the immune microenvironment. Stem cells can regulate the immune microenvironment during tissue repair and provide a good “soil” for tissue regeneration. In the current study, the regulation of immune cells by mesenchymal stem cells (MSCs) in the local tissue microenvironment and the tissue damage repair mechanisms are revealed. The application of the concepts of “seed” and “soil” has opened up new research avenues for regenerative medicine. Tissue engineering (TE) technology has been used in multiple tissues and organs using its biomimetic and cellular cell abilities, and scaffolds are now seen as an important part of building seed cell microenvironments. The effect of tissue engineering techniques on stem cell immune regulation is related to the shape and structure of the scaffold, the preinflammatory microenvironment constructed by the implanted scaffold, and the material selection of the scaffold. In the application of scaffold, stem cell technology has important applications in cartilage, bone, heart, and liver and other research fields. In this review, we separately explore the mechanism of MSCs in different tissue and organs through immunoregulation for tissue regeneration and MSC combined with 3D scaffolds to promote MSC immunoregulation to repair damaged tissues.
    Type of Medium: Online Resource
    ISSN: 1687-966X , 1687-9678
    URL: Article
    DOI: 10.1155/2019/9671206
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2019
    detail.hit.zdb_id: 2573856-2
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  • 5
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    Online Resource
    Analysis of Seismic Soil-Structure Interaction for a Nuclear Power Plant (HTR-10)
    Hindawi Limited ; 2017
    In:  Science and Technology of Nuclear Installations Vol. 2017 ( 2017), p. 1-13
    Details
    In: Science and Technology of Nuclear Installations, Hindawi Limited, Vol. 2017 ( 2017), p. 1-13
    Abstract: The response of nuclear power plants (NPPs) to seismic events is affected by soil-structure interactions (SSI). In the present paper, a finite element (FE) model with transmitting boundaries is used to analyse the SSI effect on the response of NPP buildings subjected to vertically incident seismic excitation. Analysis parameters that affect the accuracy of the calculations, including the dimension of the domain and artificial boundary types, are investigated through a set of models. A numerical SSI analysis for the 10 MW High Temperature Gas Cooled Test Reactor (HTR-10) under seismic excitation was carried out using the developed model. The floor response spectra (FRS) produced by the SSI analysis are compared with a fixed-base model to investigate the SSI effect on the dynamic response of the reactor building. The results show that the FRS at foundation level are reduced and those at higher floor levels are altered significantly when taking SSI into account. The peak frequencies of the FRS are reduced due to the SSI, whereas the acceleration at high floor levels is increased at a certain frequency range. The seismic response of the primary system components, however, is reduced by the analysed SSI for the HTR-10 on the current soil site.
    Type of Medium: Online Resource
    ISSN: 1687-6075 , 1687-6083
    URL: Article
    DOI: 10.1155/2017/2358403
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2017
    detail.hit.zdb_id: 2397941-0
    SSG: 3,6
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  • 6
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    Preliminary design of a medium-power modular lead-cooled fast reactor with the application of optimization methods
    Hindawi Limited ; 2018
    In:  International Journal of Energy Research Vol. 42, No. 11 ( 2018-09), p. 3643-3657
    Details
    In: International Journal of Energy Research, Hindawi Limited, Vol. 42, No. 11 ( 2018-09), p. 3643-3657
    Type of Medium: Online Resource
    ISSN: 0363-907X
    URL: Issue
    URL: Article
    DOI: 10.1002/er.v42.11
    DOI: 10.1002/er.4112
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2018
    detail.hit.zdb_id: 1480879-1
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  • 7
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    Preparation, Characterization, and Antitumor Evaluation of Electrospun Resveratrol Loaded Nanofibers
    Hindawi Limited ; 2016
    In:  Journal of Nanomaterials Vol. 2016 ( 2016), p. 1-11
    Details
    In: Journal of Nanomaterials, Hindawi Limited, Vol. 2016 ( 2016), p. 1-11
    Abstract: Resveratrol has been reported as a potential antitumor agent for several years. The possible application was greatly hampered by its poor solubility. The current study reported the construction of electrospun Resveratrol loaded nanofibers with methoxypolyethylene glycol-poly(caprolactone) (mPEG-PCL) block copolymers as drug carriers. Characterization studies showed the successful encapsulation of Rsv in the nanofibers with an in vitro sustained release pattern. In vitro XTT assay suggested the superior cytotoxicity of Rsv-NFs with more apoptosis induction on cancer cells. Cells that exposed to Rsv-NFs showed less clonogenic ability when compared to the equivalent dose of free Rsv. In addition, the migration and invasion ability of cells were also significantly lower when treated with Rsv-NFs. In the in vivo study, local implantation of Rsv-NFs greatly increased the growth inhibitory effect compared to free Rsv. Therefore, results from the current study demonstrated a promising way to improve the antitumor effect of Rsv by nanofiber delivery.
    Type of Medium: Online Resource
    ISSN: 1687-4110 , 1687-4129
    URL: Article
    DOI: 10.1155/2016/5918462
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2016
    detail.hit.zdb_id: 2229480-6
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  • 8
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    Water-Saving Benefit Model Analysis of Plain Reservoirs in Arid Areas Based on Nonlinear Data Prediction under Floating Ball Cover
    Hindawi Limited ; 2022
    In:  Scientific Programming Vol. 2022 ( 2022-8-19), p. 1-7
    Details
    In: Scientific Programming, Hindawi Limited, Vol. 2022 ( 2022-8-19), p. 1-7
    Abstract: In order to reduce the ineffective evaporation of plain reservoirs in arid areas, strengthen the effective utilization of water resources, and explore effective water-saving benefit models. Research methods: Field tests were carried out with antievaporation floating balls with different coverage rates, and the water-saving rate and economic benefits under floating ball coverage were analyzed. By analyzing the frequency of different wind speeds, daily evaporation under different coverage rates, monthly evaporation inhibition rates under different coverage rates, and the cost of materials used were analyzed. The results showed that (1) during the test period, the total evaporation from the water surface of different cover groups was 149.5 mm, 122.2 mm, 100.1 mm, 81.1 mm, and 63.1 mm, respectively, and the evaporation inhibition rates of different cover groups were 18.4%, 30.8%, 43.4%, and 58.6%, respectively. (2) Comprehensive consideration of the preliminary input and output ratio of the latter determine when the float coverage rate of 50% is the optimal coverage rate, the annual water savings of 5421.86 m 3 , the annual increase in production value of 87,700 yuan, and the float in the reservoir site operation for 5 years to reach the recovery period and start to profit. (3) Based on the analysis of the economic indicators of laying floating balls in a large area of the reservoir and the calculation of the sales income and total investment, the results show that the total investment is a sensitive factor, and the project has a strong risk resistance ability. Therefore, the floating ball covering method to inhibit the ineffective evaporation of water surfaces is practical and feasible in terms of reservoir water-saving and economic benefits.
    Type of Medium: Online Resource
    ISSN: 1875-919X , 1058-9244
    URL: Article
    DOI: 10.1155/2022/4016217
    RVK:
    SA 7860
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2022
    detail.hit.zdb_id: 2070004-0
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  • 9
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    Research on Fault Evolution Feature Extraction and Identification of Sun Gear Cracks in Planetary Gearbox Based on Volterra High-Order Kernel Generalized Frequency Response Graphic Analysis
    Hindawi Limited ; 2018
    In:  Mathematical Problems in Engineering Vol. 2018 ( 2018-10-11), p. 1-18
    Details
    In: Mathematical Problems in Engineering, Hindawi Limited, Vol. 2018 ( 2018-10-11), p. 1-18
    Abstract: In this paper, relying on the Volterra series nonlinear system model and the high-order kernel Hilbert’s reconstructed kernel fast solved algorithm, a fault feature frequency domain identification method based on Volterra high-order kernel generalized frequency response graph analysis is proposed. Firstly, the method uses the system input and output vibration signals to determine the Volterra model. Then, the Volterra high-order kernel function is solved quickly by reproducing kernel Hilbert space method, and the generalized frequency response function is used to identify the model. Finally, multidimensional high-order spectral pattern analysis is used to separate and extract the fault and degree characteristic information implied by frequency and phase coupling in the third-order kernel function. Following the theoretical approach, in the experimental part, this paper uses the planetary gearbox fault loading test rig to complete the data collection and establishes the Volterra experimental model through the measured data. The generalized frequency responses of each order kernel function are compared and analyzed and the capability of distinguishing and the adaptability of different order kernel functions for the degree of crack failure are discussed. The effects of changing the memory length of the Volterra model and the order of the kernel function on the recognition result are verified. The final experimental results show that the use of reproducing kernel Hilbert space can effectively avoid the dimension disaster problem that occurs in the high-order kernel solution process. Moreover, the third-order kernel can describe more intuitively the nonlinear system model under multifactor coupling than the second-order kernel. Finally, Volterra series model the third-order kernel’s generalized frequency response can effectively distinguish between nondefective and faulty gears, and its resolution is enough to distinguish the degree of failure of gear cracks.
    Type of Medium: Online Resource
    ISSN: 1024-123X , 1563-5147
    URL: Article
    DOI: 10.1155/2018/6251051
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2018
    detail.hit.zdb_id: 2014442-8
    SSG: 11
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  • 10
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    An Approach to Semantic and Structural Features Learning for Software Defect Prediction
    Hindawi Limited ; 2020
    In:  Mathematical Problems in Engineering Vol. 2020 ( 2020-04-06), p. 1-13
    Details
    In: Mathematical Problems in Engineering, Hindawi Limited, Vol. 2020 ( 2020-04-06), p. 1-13
    Abstract: Research on software defect prediction has achieved great success at modeling predictors. To build more accurate predictors, a number of hand-crafted features are proposed, such as static code features, process features, and social network features. Few models, however, consider the semantic and structural features of programs. Understanding the context information of source code files could explain a lot about the cause of defects in software. In this paper, we leverage representation learning for semantic and structural features generation. Specifically, we first extract token vectors of code files based on the Abstract Syntax Trees (ASTs) and then feed the token vectors into Convolutional Neural Network (CNN) to automatically learn semantic features. Meanwhile, we also construct a complex network model based on the dependencies between code files, namely, software network (SN). After that, to learn the structural features, we apply the network embedding method to the resulting SN. Finally, we build a novel software defect prediction model based on the learned semantic and structural features (SDP-S2S). We evaluated our method on 6 projects collected from public PROMISE repositories. The results suggest that the contribution of structural features extracted from software network is prominent, and when combined with semantic features, the results seem to be better. In addition, compared with the traditional hand-crafted features, the F -measure values of SDP-S2S are generally increased, with a maximum growth rate of 99.5%. We also explore the parameter sensitivity in the learning process of semantic and structural features and provide guidance for the optimization of predictors.
    Type of Medium: Online Resource
    ISSN: 1024-123X , 1563-5147
    URL: Article
    DOI: 10.1155/2020/6038619
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2020
    detail.hit.zdb_id: 2014442-8
    SSG: 11
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